Low-ohmic Resistors For Current Detection In Automotive/Industrial Equipment

ROHM is now mass producing high-power low-ohmic shunt resistors for current detection in high-power applications in the automotive, industrial and large-scale consumer electronics sectors. To meet the demands for a wider resistance range, the new GMR series features resistances from 5 mΩ to 220 mΩ compared to the firm’s previous PSR series (0.1 mΩ to 3 mΩ).

The GMR100 series is ideal for automotive applications such as ECUs, EPS systems, inverters, etc.; for industrial equipment such as UPS, general-purpose inverters; and consumer goods, such as inverters for refrigerators, air conditioning units and washing machines.

The new shunt resistors claim a high rated power of 3 W and their resistance tolerance is specified with F (±1 %). The temperature coefficient of resistance (TCR) is ±20 ppm/°C.

“The use of special materials and structures has allowed ROHM to successfully reduce surface temperature rise by 45% compared with conventional products. As a result, the shunts achieve stable resistance not only during normal operation but at overcurrent loads as well”, says the firm.

Furthermore, they are said to feature an excellent temperature coefficient of resistance (TCR) even in the low resistance region, which in turn ensures greater accuracy and reliability.

“The new GMR100 series resistors are 47% thinner than existing solutions, providing greater scope in applications with strict temperature requirements, such as automotive systems and industrial equipment, helping to reduce design load and contribute to further end-product miniaturisation”, stated the firm.